US Bridges

Rock Quarry RD over Clear CR

Poor

Boone County, Missouri · S 31 T 48 N R 12 W · Structure no. 24037

Built
1981
44 years old
Condition
Poor
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Rock Quarry RD over Clear CR is a prestressed concrete tee beam carrying Rock Quarry RD over Clear CR in Boone County, Missouri. It was built in 1981, so it is 44 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 250 vehicles a day, roughly 5% of them trucks, projected to reach 475 by 2043. The structure is 46 ft (14 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRock Quarry RD
CrossesClear CR
LocationS 31 T 48 N R 12 W
RouteCounty Highway 451
CountyBoone County
StateMissouri
Coordinates38.89512, -92.31312
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic475 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$324,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock Quarry RD over Clear CR built?

It was built in 1981, making it 44 years old in 2025.

What condition is Rock Quarry RD over Clear CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Rock Quarry RD over Clear CR carry?

About 250 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Rock Quarry RD over Clear CR?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 23 ft wide.

Who owns Rock Quarry RD over Clear CR?

It is owned by the County Highway Agency.